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7000ft DA is nothing to sneeze at! I'm kind of impressed with 3.44 for the base at that density altitude.
I still haven't made the trek down to the nearest quarter mile track (~2.5hrs) but I'm sure I will one day. There just aren't many (any?) decent roads to hit a quarter mile run on within an hour of my house, so I rarely get the opportunity to test.
This was my best quarter run, and you'll notice by the orange (acceleration) trace that I braked early before the quarter so I think this would've been sub-11 without that. 3.45 to 60 is inclusive of rollout, the no-rollout time was 3.25 (but that slip was invalid for -1.05% grade). Between that and the 60' time of 1.94, I think this launch could have been way better and ET might have been as low as 10.5 on a prepped surface
7000ft DA is nothing to sneeze at! I'm kind of impressed with 3.44 for the base at that density altitude.
I still haven't made the trek down to the nearest quarter mile track (~2.5hrs) but I'm sure I will one day. There just aren't many (any?) decent roads to hit a quarter mile run on within an hour of my house, so I rarely get the opportunity to test.
This was my best quarter run, and you'll notice by the orange (acceleration) trace that I braked early before the quarter so I think this would've been sub-11 without that. 3.45 to 60 is inclusive of rollout, the no-rollout time was 3.25 (but that slip was invalid for -1.05% grade). Between that and the 60' time of 1.94, I think this launch could have been way better and ET might have been as low as 10.5 on a prepped surface
Over 130 mph trap speed and you braked early! That is faster than the Turbo S 1/4. I would love to see a real time slip from a real track to validate all the draggy times.
Zachr - Maybe I missed it, but is this for a stock or tuned 992S? Your 1/8 mile time is similar to mine, but your trap speed is considerably faster.
GTS with M-Eng Stage 2, Europipe 100 cell cats, and BMC filters (which I assume do nothing for performance, but sound nice!).
Judging by your 60' and 330' times, and the steadiness of your orange acceleration trace versus my bouncy trace at the start, your launch was quite good. It also looks like you've got a bit of a lift/brake at the end of your 1/8th based on the orange trace. With the tune the car holds that acceleration pace much longer — you can see my car is still pulling close to 0.4g before I lift at 130mph, while yours is around 0.4g at the end of the eighth going 90.
GTS with M-Eng Stage 2, Europipe 100 cell cats, and BMC filters (which I assume do nothing for performance, but sound nice!).
Judging by your 60' and 330' times, and the steadiness of your orange acceleration trace versus my bouncy trace at the start, your launch was quite good. It also looks like you've got a bit of a lift/brake at the end of your 1/8th based on the orange trace. With the tune the car holds that acceleration pace much longer — you can see my car is still pulling close to 0.4g before I lift at 130mph, while yours is around 0.4g at the end of the eighth going 90.
Yes, I did lift my foot of the gas close to reaching 1/8 mile….barely long enough to even 1/8, not to mention shortly after reaching 1/8 mile, was a safety bump…so needed to bring the car’s speed down in a hurry before going over the safety bump.
Over 130 mph trap speed and you braked early! That is faster than the Turbo S 1/4. I would love to see a real time slip from a real track to validate all the draggy times.
do you feel like the times on draggy are off? i think it uses gps satellites for reporting times. i suspect if there is any error it is minor. i think c/d did a ~ 125 miles pass in an 992S but it might have been a 2020 or 2021. so 130mph on a tuned one is what i would expect. the 992s love to be in the 90-130 mph range, at least mine does.
plus, finding a great road to use the draggy is like getting a cookie.
According what I was told by Draggy technical support, the accuracy of their times is about +/- 0.05 sec (tested against actual drag strip times).
All I know is that the readings, for me, are pretty consistent. When I get anything much more than 3.2 sec to 60, I know as soon as I launch that it won’t be a good run. Launch is critical…
I would also say that Draggy will tell you if the run is INVALID because of either poor GPS signals, or a slope in the road of sufficient grade to impact the times/speed. If done correctly, GPS has been shown by independent sources to be extremely accurate.
Last edited by CodyBigdog; 12-08-2023 at 10:12 AM.
According what I was told by Draggy technical support, the accuracy of their times is about +/- 0.05 sec (tested against actual drag strip times).
All I know is that the readings, for me, are pretty consistent. When I get anything much more than 3.2 sec to 60, I know as soon as I launch that it won’t be a good run. Launch is critical…
I would also say that Draggy will tell you if the run is INVALID because of either poor GPS signals, or a slope in the road of sufficient grade to impact the times/speed. If done correctly, GPS has been shown by independent sources to be extremely accurate.
If you look over in the turbo section where people post time slips and draggy runs together, the draggy shows consistently higher trap speeds than the time slips. 2 or 3 mph in the 1/4 is a lot of hp.
If you look over in the turbo section where people post time slips and draggy runs together, the draggy shows consistently higher trap speeds than the time slips. 2 or 3 mph in the 1/4 is a lot of hp.
OK, thanks.
But I am 100% confident that their times are accurate to 0.05 sec, maybe better. There have been many independent reviews on this. I don’t pay attention to the trap speed, so I don’t have any opinion on that. Here is a comment from a member of the BMW Club, of which i use to be an active member. As an aside, given the stated accuracy from Draggy techs as 0.05 sec, over a 1/4 mile, can result in about a 1 mph difference from those measured at a drag. But folks at BMW, using 3 different draggy devices, have shown speed accuracies at 1/4m to be within 0.3-0.5 mph of the trap speed.
”Dragy has been validated against many other performance measurement devices including the professional systems used as drag strips. In testing we conducted at PBIR with 3 different Dragys, it was within 0.04s for the 1/4 mile time and 0.3 - 0.5mph on trap speed.”
Last edited by CodyBigdog; 12-08-2023 at 04:36 PM.
12-07-2023, 10:00 AM
